For the two systems $($system X and Y $)$ described below, answer these questions:

$($a$)$ Determine the needs for each process in each system.

System X has $12$ devices.

$[4$ marks$]$

System Y has $14$ devices.

$[3$ marks$]$

$($b$)$ Determine whether each system is safe or unsafe.

$($c$)$ If the system is in a safe state, list the sequence of requests and releases that it will make it possible for all processes to run to completion.

$[2$ marks$]$

$($d$)$ If the system is in an unsafe state, show how it's possible for deadlock to occur.

$[2$ marks$]$